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PM 2.5 @ 11/21/2011

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from: http://www.nasa.gov/topics/earth/features/health-sapping.html


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Global satellite-derived map of PM2.5 averaged over 2001-2006.
Credit: Dalhousie University, Aaron van Donkelaar
发布于 11/21/2011 10:48:57 | 评论:0

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